Truck won't stay running

I have a 03 Dodge Ram 1500 4.7. Driving down road at 35-40 mph the truck will shut off. You have to turn switch off and crank it back up an it will run again until you go 35-40 mph. What causes this?(I have changed and check oil, changed transmission fuild an filters, replaced pressure sensor on transmission, replaced throttle flow sensor and changed gas cap and cleaned 02 sensors)

I have a 2001 dodge 1500 pickup. The truck fires right up but will not stay running unless I keep my foot on the gas. As soon as I let off the throttle it dies instantly without sputtering. Gauges rea...

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